The average life of the cold drawing punch for the inner ring of 203 and 102 bearings made of CH1 steel is 15,000 pieces, which is 5 times longer than that of GCr15/52100 steel.

 

During service, the cold drawing die for the bearing ring not only bears large impact loads, but also bears high extrusion and bending stresses. Therefore, the die is required to have not only high tensile strength and bending strength, but also good impact toughness. Using CH1 steel instead of GCr15/52100 steel to manufacture the cold punch die for the bearing ring, and through appropriate heat treatment, the service life of the die can be greatly improved. The process and performance comparison is shown in the following figure:

 

Mechanical properties at room temperature
Material σbc /Mpa σbb /Mpa Ak / (J/cm2) f /mm HRC Molds service life / pcs
GCr15 3618 2008 5.1 8.5 60.5 ~ 5,000
CH1 4044 2403 15.48 9.5 60 ~15,000

 

* GCr15 : 848℃ oil quenching, 150℃ x 2h tempering 

* CH1 : 890℃ oil quenching, 200℃ x 2h tempering

 

Composition comparison : 

Material C Si Mn P S Cr Mo V Ni Cu Remark
GCr15 0.95~1.05 0.15~0.35 0.25~0.45 ≤0.025 ≤0.025 1.40~1.65 ≤0.10 / ≤0.30 ≤0.25 Ni+Cu≤0.50
CH1 0.65~0.75 0.85~1.05 0.80~1.05 ≤0.025 ≤0.025 0.90~1.20 0.25~0.50 0.15~0.30 ≤0.25 ≤0.25  

 

 

If you get any interests in CH1/7CrSiMnMoV steel from ALTA, please contact us now!

 

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Take CH1/7CrSiMnMoV steel to produce cold drawing punch for bearing inner race (average service life ~15,000 pcs)

2024-07-10 16:16